Turbine ring assembly with axial retention

Abstract

A turbine ring assembly includes both a plurality of ring sectors made of ceramic matrix composite material forming a turbine ring and also a ring support structure having two annular flanges, each ring sector having two tabs held respectively between the two annular flanges of the ring support structure. The two annular flanges of the ring support structure exert stress on the tabs of the ring sectors. One of the flanges of the ring support structure is elastically deformable in the axial direction of the turbine ring. The turbine ring assembly further includes a plurality of pegs engaged both in the annular flanges of the ring support structure and in the tabs of the ring sectors facing the annular flanges.

The invention claimed is: 
     
       1. A turbine ring assembly comprising:
 a plurality of ring sectors forming a turbine ring; and 
 a ring support structure having two annular flanges, 
 wherein each of the plurality ring sectors has a first portion forming an annular base with an inner face defining an inside face of the turbine ring and an outer face from which two tabs extend radially, the two tabs of each of the plurality ring sectors are held between the two annular flanges of the ring support structure, a portion of the two annular flanges of the ring support structure respectively in contact with the two tabs to exert a stress on the two tabs of the ring sectors, 
 wherein at least one of the two annular flanges of the ring support structure is elastically deformable in an axial direction of the turbine ring, 
 wherein each ring sector is made of ceramic matrix composite material and includes a plurality of pegs engaged both in at least one of the two annular flanges of the ring support structure and in the tabs of the ring sectors facing said at least one of the two annular flanges, 
 wherein the at least one elastically deformable flange of the ring support structure has a thickness that is less than a thickness of the other flange of said ring support structure, and 
 wherein the at least one elastically deformable flange of the ring support structure has a plurality of hooks, the hooks being distributed over a face of the elastically deformable flange opposite from a face facing the tabs of the ring sectors. 
 
     
     
       2. The turbine ring assembly according to  claim 1 , wherein at least one of the annular flanges of the ring support structure includes a lip, the lip provided on a face of the at least one of the annular flanges that faces the tabs of the ring sectors. 
     
     
       3. A method of making a turbine ring assembly, the method comprising:
 fabricating a plurality of ring sectors, each ring sector having a first portion forming an annular base with an inner face defining the inside face of a turbine ring and an outer face from which two tabs extend radially; 
 fabricating a ring support structure having two annular flanges; 
 mounting each ring sector between the two annular flanges of the ring support structure, a spacing between the two flanges of the ring support structure being smaller than a distance between outer faces of the two tabs of each ring sector such that a portion of the two annular flanges of the ring support structure is in contact with the outer faces of the two tabs to exert a stress on the two tabs, at least one of the two annular flanges of the ring support structure being elastically deformable in an axial direction of the turbine ring; 
 wherein each ring sector is made of ceramic matrix composite material, in that during mounting of each ring sector, traction is exerted in the axial direction of the turbine ring on said elastically deformable flange so as to increase the spacing between the two flanges and engage the tabs of the ring sector between the two flanges of the ring support structure, 
 wherein the method further comprises engaging a plurality of pegs both in at least one of the annular flanges of the ring support structure and in the tabs of the ring sectors facing said at least one annular flange, 
 wherein the at least one elastically deformable flange of the ring support structure has a thickness that is less than a thickness of the other flange of said ring support structure, and 
 wherein the at least one elastically deformable flange of the ring support structure includes a plurality of hooks, the hooks being distributed over a face of the at least one elastically deformable flange opposite from a face facing the tabs of the ring sectors, traction being exerted in the axial direction of the ring on said at least one elastically deformable flange by a tool engaged in one or more of the plurality of hooks. 
 
     
     
       4. The method according to  claim 3 , wherein at least one of the annular flanges of the ring support structure includes a lip on a face of the at least one of the annular flange that is facing the tabs of the ring sectors.